Deep inside Africa, in the territory of savage tribes, downwards on a jungle river... mysterious powers guard the legendary emerald castle's wonderful treasures... you won't get there... or maybe you will?

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A man and daughter in the woods are attacked by something that is most like an echo-like creature. Despite the warning, some young people choose to spend the night in a wooded chalet. They soon discovered that besides the demonic creature mentioned earlier, there was some other horror, aliens who came with a hidden spaceship.

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